Five-Lens Imaging System Compact Length Aberration Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

There is a demand for imaging lenses that can be miniaturized to fit thinner devices like smartphones and tablets while maintaining high resolution and performance, especially with increasing pixel counts in imaging elements.

Innovation Solution

The development of a five-lens imaging lens configuration with specific refractive powers and shapes, including a first lens with positive power and a convex surface, a second biconcave lens, a third meniscus lens with positive power, a fourth lens with a concave surface, and a fifth meniscus lens with negative power, optimized to satisfy conditional formulas for improved optical performance and reduced total length.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the number of lenses is increased to five lenses for high resolution, then imaging performance is improved, but total lens length increases

Engineering Contradiction:

Improveimaging resolutionVSAvoidtotal lens length

Core Design Contradiction:

Measurement precisionVSLength of moving object

Solution Approach 1:

The patent applies parameter changes by precisely controlling the focal length ratio between the third lens and the entire system (0.75 < f/f3), the refractive indices of lens materials, and the curvature radii of lens surfaces. These parameter optimizations enable the five-lens configuration to achieve high imaging resolution while reducing the total lens length to 4.9mm or less.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material design by selecting specific glass materials for each lens element with different refractive indices and dispersion properties. The first lens uses material with Nd=1.544885 and νd=54.87, while the fourth lens uses material with Nd=1.633512 and νd=23.63, creating an optimized composite optical system that achieves both compact size and high resolution.

Inventive Principle:

Principle #40Composite materials

2Length of moving object

If the total lens length is shortened for thinner devices, then device thickness is reduced, but imaging performance deteriorates

Engineering Contradiction:

Improvetotal lens lengthVSAvoidimaging resolution

Core Design Contradiction:

Length of moving objectVSMeasurement precision

Solution Approach 1:

The patent achieves the dual goal of shortening total lens length to 4.9mm or less while maintaining high imaging performance through precise parameter control. The conditional formula 0.75 < f/f3 optimizes the focal length distribution, and the specific refractive indices and curvature radii are carefully selected to maintain image quality despite the compact size.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs aspherical surface designs for multiple lenses (first, third, fourth, and fifth lenses) to dynamically correct optical aberrations in the compact configuration. The aspherical coefficients are optimized to maintain high imaging resolution despite the reduced total lens length, allowing the system to adapt to the compact form factor while preserving performance.

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration achieves a shorter total lens length while maintaining high resolution and correcting various aberrations, making it suitable for devices with higher pixel counts and wider angles of view.